asn.dev

Autonomous system

AS20214 COMCAST-20214

Unclassified ARIN

IPv4 addresses 1.72M 191 prefixes
IPv6 prefixes 99 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 23 downstream
Flagged prefixes 0 none

Summary

Comcast

United States of America · AI-generated

residential cable isp us

COMCAST-20214 is operated by Comcast Cable Communications, LLC.

What it's used for

  • The address space carries residential cable internet traffic, evidenced by reverse DNS entries such as c-76-109-127-254.hsd1.fl.comcast.net and netnames like MIAMI-12 and POMPANO-15.
  • With 1,720,832 IPv4 addresses announced across 191 prefixes and only 25 observed neighbours, the high address-to-neighbour ratio indicates a large access or eyeball network rather than a transit provider.

Notable

  • Registrants are consistent with the announcer, including Comcast Cable Communications, LLC, Comcast Cable Communications, Inc., and Comcast Cable Communications Holdings, Inc.
  • The address inventory is dominated by large /16 blocks in the 76.0.0.0/8 and 66.0.0.0/8 ranges, with a single outlier netname TELEMATICS registered to Telematics International for 147.137.0.0/16.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

2 upstream, 23 downstream and 29 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS7922Comcast Cable Communications, LLC4,177
AS3356Level 3 Parent, LLC100

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 191 prefixes · 1.72M addresses IPv6 99 prefixes

CountryNamePrefixes
USUnited States of America290

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS20214
Registry name
COMCAST-20214
Registrant
Comcast Cable Communications, LLC
Abuse contact
abuse@comcast.net
Registered
2001-04-06
Last changed
2021-01-25
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
96% valid · 112 valid, 5 with no ROA
ROAs
396 authorising AS20214
ASPA
no ASPA record
IRR
82% registered · 96 of 117 announcements 3 other origin
Route objects
180 naming AS20214

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,781 prefixes, as published 2026-10-16. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check